The world is overpopulated with people as much as it is overpopulated with cats/dogs. The reason I bring this up is get people thinking. I'm not trying to say that I don't agree that spaying/neutering your pets is the responsible thing to do I'm not saying that we should do that to a human being either. But I feel that this subject needs to be explored.
They are definitely two different subjects but at the same time they do go hand in hand. They have their similarities in many many ways. And for those of you that think that overpopulation only happens in third world countries, think again. How many homeless/orphaned children do you think there are in the United States? Do some research.